Fluid propeller



May is 19266 W. H. LEINWEBER FLUID PROPELLER Filed March 10, 1924 I IN VEN TOR. Mum/WM awn 55 55.

ATTORNEYS.

arts-o rATssf sms- WILLIAM H. LEIN'W-EBER, OF CHICAGO, ILLINOIS, ASSIGNOR TO III-LO. FAN CORPORA- TION, OF CHICAGO, ILLINOIS, A. CORPORATION OF DELAWARE.

FLUID Pno rnLLnR.

Application filed March 10, 192;. Serial No. $98,072.

The present invention relates to rotary fluid propellers or fans and other like and similar devices having blades capable of eX- erting stresses upon fluids when the device is caused to rotate;

It has been noted that when a fan, propeller, or similar device is rapidly rotated there emanates therefrom asort'of metallic sound, ring or tone which seems to be amplified by the blades, the latter also appearing to act as resonators. This sound often be comes monotonous and disagreeable and although the elimination of it has been long desirable, it has remained for the present invention to accomplish such end. It was "discovered that if the blades could be sound insulated from the shaft, spindle or rotary hub of the driving mechanism, the objectionable sound could be eliminated.

It is, therefore, amon the objects of the invention to provide for separating the blades from the shaft or spindle hub of the driving means so that there will not be a continuity of the material, such as metal, from the shaft to the blades; to provide for insulating the blades from the shaft or spindle, yet have a rigid structure whereby the blades would rotate with the shaft or spindle as one; to so arrange the insulation that one set of blades would be insulated from the other and both sets be at the same time insulated from the shaft or spindle, and to provide such further and other objects, ad- .vantages and capabilities as will later appear and are inherently possessed by the invention.

In the drawings showing an illustrative embodiment of the invention, Fig. l is a front view of a propeller or fan, and Fig. 2 is a transverse sectional view taken on line 2-2 of Fig. 1'.

Referring now more particularly to the drawing showing a preferred embodiment of the invention, the latter is shown as comprising a shaft or spindle 1 having a hub portion 5;

annular recess 3 in which is located a sleeve 4 of sound insulating or deadening material an apertured web such that one pair of.

reduced in diameter to form an blades has a web 6 and the other pair of blades has a web? and alternating with these webs are a number of 'apertured discs 8, 9

and 10 of suitable sound insulating or deadening material and which serve to'insulate ends of the sleeve 3 and bearing against shoulders 13 and 14; of the shaft 1. The shoulder 13 is formed after the parts are as sembled by spinning or riveting the end of the shaft 1 so as to form the shoulder against the'washer 11. I

did

It willbe noted that the sleeve 3 is interposed between the webs 6 and 7 of the blades and the portion 2 of the shaft 1 so that there is not a continuity of the metal from the 'the drawing shown a preferred embodiment of the invention, it is to be understood that it is not limited to the particular construc-= tion, details and arrangement of parts de scribed and shown, but that it also comprehends other constructions, details, and ar rangements of parts without departing from the spirit of the invention.

Having thus described my invention, l 0.111111:

1. A sound insulator for fan and propeller blades. comprising an insulating sleeve and I disks between the blades and around the hub thereof.

2. A device of the character disclosed,

, comprising ,a rotary hub, a sound insulating sleeve secured in the hub, and blades secured to the insulating sleeve whereby transmis sion of sound between the hub and blades is prevented.

and a hub, an insulating sleeve interposed between the hub and blades to provide discontinuity of hub and blade material for eliminating transmission of sound from one to the other.

3. A rotary airblower comprising blades 4. A device of the class disclosed, coml prising a rotary spindle, an insulating sleeve on the spindle and rotatable therewith, and

blades on the sleeve and rotatable therewith, on said portion, blades having apertured whgreby icslllie blades are sound insulated from hubs around said sleeve, and apertured in- Sa]. 111 e.

5. E device of the character disclosed, nating with said hubs for insulating said comprising a rotary spindle having spaced hubs fromeach other and from the shaft, shoulders, blades between said shoulders, and said sleeve serving to insulate the shaft from insulating disks between said blades and said said hubs. shoulders whereby the blades are out of con- '9.. A fluid propeller comprising a hub, a tact with said splndle. recess in said hub, a sleeve of sound insulat- 6. A device of the character disolosed ing material in said recess, sound insulating comprising a rotary hub having spaced disks, a plurality of blades and the webs of shoulders, insulating discs between said said blades held between said disks. shoulders, blades between said discs a'ndout 10. device of the class described comof contact with said hub. I prising a'spindle, a hub, a sleeve of deaden- 7. A device of the character disclosed, mg material in said hub, a plurality of racomprising a rotary hub having spaced dially extending blades, sound insulating shoulders, sound insulating discs between disks, webs of said platesheld in said disks,

said shoulders, blades between, saiddiscs, saidsleeve and disks adaptedto isolate any and an insulating isleeve betweensaid hub metal contact between blade, spindle and and said blades and discsv whereb sound hub so that continuity of sound between said cannot be transmitted from the hu to'the members is prevented.

blades, L In witness whereof, I hereunto subscribe 8 In a device of the character disclosed my name to this specification.

and comprising a rotary shaft having a reduced diameter portion, an insulating sleeve WILLIAM H. LEINWEBER.

sulating discs around said sleeve and alter-1 

